Journal
ADVANCED ENERGY MATERIALS
Volume 7, Issue 21, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201700467
Keywords
Co, N-codoped carbon nanoframes; NiFe layered double hydroxide; oxygen evolution reaction; oxygen reduction reaction; rechargeable zinc-air batteries
Categories
Funding
- Ministry of Science and Technology of China [2014CB239402, 2013CB834505]
- National Key Projects for Fundamental Research and Development of China [2016YFB0600900]
- National Natural Science Foundation of China [51572270, U1662118, 51322213, 21401206, 21401207]
- Chinese Academy of Sciences [XDB17030300]
- Beijing Natural Science Foundation [2152033, 2154058]
- Youth Innovation Promotion Association
- National Program for Support of Topnotch Young Professionals
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The future large-scale deployment of rechargeable zinc-air batteries requires the development of cheap, stable, and efficient bifunctional electrocatalysts for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). In this work, a highly efficient bifunctional electrocatalyst is prepared by depositing 3-5 nm NiFe layered double hydroxide (NiFe-LDH) nanoparticles on Co,N-codoped carbon nanoframes (Co,N-CNF). The NiFe-LDH/Co,N-CNF electrocatalyst displayed an OER overpotential of 0.312 V at 10 mA cm(-2) and an ORR half-wave potential of 0.790 V. The outstanding performance of the electrocatalyst is attributable to the high electrical conductivity and excellent ORR activity of Co,N-CNF, together with the strong anchoring of 3-5 nm NiFe-LDH nanoparticles, which preserves active sites. Inspired by the excellent OER and ORR performance of NiFe-LDH/Co,N-CNF, a prototype rechargeable zinc-air battery is developed. The battery exhibited a low discharge-charge voltage gap (1.0 V at 25 mA cm(-2)) and long-term cycling durability (over 80 h), and superior overall performance to a counterpart battery constructed using a mixture of IrO2 and Pt/C as the cathode. The strategy developed here can easily be adapted to synthesize other bifunctional CNF-based hybrid electrodes for ORR and OER, providing a practical route to more efficient rechargeable zinc-air batteries.
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